North American Butterflies and Moths List

The definitive website on wildbirds & nature

Butterflies of North America

Butterflies of Montana

Clouded Sulphur (Colias philodice)

Clouded Sulphur (Colias philodice Godart)

Wing span: 1 1/2 - 2 3/4 inches (3.8 - 7 cm).

Identification: Upper surface of male wings bright, clear yellow
with solid black edging; lower side of forewing with some dark
submarginal spots; hindwing with silver cell spot rimmed with
orange-pink, usually doubled. Female has 2 forms: yellow form
with uneven black edging enclosing yellow spots, and a white form
which is greenish-white rather than yellow. Spring and fall forms
are smaller and less conspicuously marked.